The throne was ORIGINALLY a commercial venture,
after one of the BBC production team saw it,
they thought it might be used as the Duke of Manhattans chair? This idea was of course dropped .When the Cyberman
story was going into production, the idea came up to use the throne as the Cyberthrone for the Cybercontroller.
So the throne was heavily revamped and set dressed to become the throne we all know today.